Stopping mechanism for looms



Marh 25, 1930. w. CRUTCHLOW 1,751,979

STOPPING MECHANISM FOR LOOMS Filed March 22, 1929 WITNESS Patented Mar. 25, 1930 PATENT OFFICE WILLIAM .CRUTCHLOW, or FULLERTON, PENNSYLVANIA STOPPING MECHANISM FOR LOOMS Application filed March 22, 1929. Serial Nb. 349,056.

This invention relates to looms and its object is to provide means for stopping a loom when a predetermined advance of the sheet of warp and woven cloth has occurred which shall be at once simple, reliable and efiicient and capable of application to an existing loom without appreciable change of any of the parts thereof.

The invention is fully illustrated in the accompanying drawing in which Fig. 1 is a section on line 1.1 of Fig. 2, showing the breast-beam and lay-structureof a loom with the mechanism of the present 1nvention in position thereon; Fig. 2 is a plan of the breast-beam and so much of said mechanism as is carried thereby; and

Fig. 3 a side elevation of what is shown 1n Fi 2.

Y The fixed structure of the loom includes the frame 1 and breast-beam 2 thereon. 3 is the lay-structure arranged to reciprocate toward and from the breast-beam. The loom may have any well-known type of stopping 5 mechanism and a movable part thereof,

adapted to be actuated as will hereinafter appear to cause the stopping, may be the knockoff shaft 4 arranged to rock in the frame 1 and having a projecting lug 5 to re 30 ceive the impact by which such rocking is effected.

A dagger 6 is pivoted at 7 on a bracket 8 on the lay-structure 3 and is connected by the link 9 with the weft-fork 10. These parts, with the push-rodll which elevates the rear end of the dagger and hence the weft-fork to permit the shuttle to pass when the lay-structure moves back, form a well-known adjunct of a loom: the dagger is adapted to be moved (in the present case upwardly) by the weight of its rear end portion to a position where its forward end will engage the lug 5 and move the knock-off lever to stop the loom on the forward movement of the lay-structure, being normally held, however, from assuming that position by the filling laid by the shuttle so long as such filling is properly present under the weft-fork on each such movement.

For effecting the stopping of the loom when a predetermined advance of the sheet of warp A and woven fabric B has occurred I provide means, controlled from said sheet, whereby the dagger or equivalent device will be moved out of the position in which it is thus normally held and into position to on gage the knock-off shaft 4 (at 5) or its equivalent, thus:

A rock-shaft 12 is journaled in brackets 13 at the back of the breast-beam and secured thereon by a screw 14 is a collar 15 which has projecting therefrom a downwardly curved blade 16 underlying the forward or free end of the dagger, so that when the rock-shaft is moved to the position where the blade stands as shown by dotted lines in Fig. 1 said blade will cam the point of the dagger upward into position to impinge against the lug 5 on the next forward movement of the lay-structure. The rock-shaft is normally urged to rotate in the direction indicated by a spiral spring 17 connecting an arm 18 on the rock-shaft with some fixed point; and for holding the rock-shaft against such movement under the tension of the spring (or in the position shown by full lines in Fig. 1) there is a detent means comprising a. spring blade 19 (fixed to a bracket 27 to be described) and having a lug 20 to engage another arm 21 fixed on the rock-shaft. lVhen the detent device is pressed from the observer in Fig. 1 the rock-shaft is released and the blade 16 thereof assumes the stated position for camming or fending the dagger into position to engage with the lug 5 of the knock off shaft.

This releasing movement of the detentdevice may be effected from any part of the advancing sheet A-B of the warp and fabric, but I prefer to effect it from'the fabric or cloth. For this purpose there is the following mechanism: In addition to the gear 22 on the sand roller 23 of the loom by which the same is as usual driven the sand roller has a pinion 24 and this meshes with a gear 25 whose shaft 26 is journaled in brackets 27 secured to the frame. In another bracket 28 secured to the frame is fixed by a set screw 29 an upright post 30 having aflixed to its upper end a pointer 31. On the post is journaled a worm-wheel 32 which is seated on a spiral spring 34, the position of the worm wheel being thus normally such that its teeth engage a worm 35 on the shaft 26. The detent device 19 has an arm 19 which has its free end rebent and extending obliquely across the path of travel of a stud 32 which upstands from the worm Wheel, which may be indexed as shown and thus forms a dial.

In order to set the mechanism so that the loom Will stop when a predetermined extent of yardage has been Woven the weaver, having shifted the means constituted by shaft 12 and its mentioned adjuncts to the full-line ing lay-structure, a device to engagesaid member and: thus move the same movable with the lay-structure and also shiftable thereon into position to engage said member, and means, controlled from the advancing sheet of Warp and Woven fabric,- to thus cause said devices to shift when said sheet has advanced to predetermined extent.

2. The combination of the fixed structure of a loom, a stopping member movable therein to cause stopping of the loom, a reciprocat ing lay-structure, a device to engage said member and thus move the same movable with the lay-structure and also shiftable thereon into position to engage said member, means normally movable to shift said device, and detent means normally holding the first means against such movement and actuable from the advancing sheet of warp and Woven fabric, when said sheet has advanced a predetermined extent, to release the first means.

3. .The combination of the fixed structure of a loom, a'stopping member therein movable to cause stopping of the loom, a reciprocating lay-structure, a device to engage and move said member, movable on the lay structure, into and out of and normally held out of position to engage said member, and means controlled from the advancing sheet of warp and means, controlled from the advancing sheet of warp and woven fabric, to cam said device into said position when said sheet has advanced a predetermined extent.

6. The combination of th fixed structure of a loom, a stopping member therein movable to cause stopping of the loom, a reciprocating lay-structure, a deviceto engageand move said member movable on the lay-structure into and out of and normally held out of position to engage said member, and means, controlled from the advancing sheet of Warp and woven fabric, to cam'said device into said position when said sheet has advanced a predetermined extent. 1

7 The combination of the fixed structure of a loom, mechanism to be tripped to cause stopping of the loom when the sheet of warp and wovenfabric has advanceda predetermined extent, a revoluble element arranged to revolve in unison with the advancing sheet,

and a revoluble tripping member for said mechanismintergeared with said element to rotate therewith and manually disconnective therefrom. p 7

8. The combination of the fixed structure of a loom, mechanism to be tripped to cause stoppingof the loom when the sheet of warp and Woven fabric has advanced a predetermined extent, a revoluble element arranged to revolve in unison with the advancing sheet, a revoluble tripping member for'said mechanismintergeared with said element to rotate therewith and movable longitudinally of its axis clear of the same, and spring means nor- 1lgially opposing such movement of said mem- In testimony whereofI afiix my signature. WILLIAM CRUTCHLOW.

and Woven fabric, to move said device into said position when said sheet has advanced apredetermined extent. I I I i e 4. The combination of the fixed structure of a loom, a stopping 1nember 'therein movable to cause stopping of the'loom,-a recip rocating lay-structure, a'device to engage and move said member, movable onthe laystruc tune, into and out of-andnorm-ally held out of positionto engage said member,- means normally urged to move and thereby move said device into said position, and 'detent 

